JWST just found its first transiting exoplanet, and it’s 99% the size of Earth. But with no atmosphere seen, perhaps air is truly rare. — For many of us, when we turn our eyes skyward, we imagine much, much more than the stars, galaxies, and the expanse of empty space that separates them. Instead, we turn our thoughts to the worlds that orbit each one of those stars: massive, gas giant planets with their own…